147 results about "Intergranular corrosion" patented technology

The invention discloses a corrosion-resistant aluminum alloy profile and a preparation method thereof, and belongs to the technical field of aluminum alloy profiles. By optimizing the components of the corrosion-resistant aluminum alloy, the strength of the aluminum alloy profile can be guaranteed, and the corrosion resistance of the aluminum alloy profile is positively influenced. Besides, the corrosion-resistant coating is formed on the surface of the corrosion-resistant aluminum alloy base material in a laser cladding mode, the corrosion resistance of the aluminum alloy profile can be remarkably improved while the application performance of the aluminum alloy profile is guaranteed, and in the corrosion-resistant coating, nickel powder can enhance pitting corrosion resistance and intergranular corrosion resistance, so that the corrosion resistance of the aluminum alloy profile is improved. The adhesive force with an aluminum alloy base material is improved; the boron nitride can improve the acid resistance and wear resistance of the surface of the aluminum alloy profile and block a corrosion channel; the lanthanum oxide and the cerium dioxide have a synergistic effect, so that surface grains can be refined, air holes generated in the cladding process are reduced, the compactness of the coating is improved, the compatibility with an aluminum alloy base material is promoted, and the apparent quality of the aluminum alloy profile is guaranteed.

The invention relates to the technical field of pressure vessel health monitoring and nondestructive testing, in particular to an electromagnetic acoustic surface wave-based pressure vessel intergranular corrosion non-contact detection system, which comprises the following modules: a multi-field coupling electromagnetic acoustic surface wave detection module, which comprises a plurality of detection unit arrays, each detection unit comprises a magnetic biasing module and an impedance matching module and is used for generating a local magnetic field on the surface of the pressure vessel and optimizing signal excitation and receiving; and the signal acquisition and preprocessing module is used for acquiring the surface wave signal of the detection module and carrying out denoising, filtering, curved surface coupling difference correction and lift-off correction on the signal to obtain high-quality signal data. According to the method, non-contact quantitative detection of the intergranular corrosion of the pressure vessel is realized through multi-field coupling electromagnetic acoustic surface wave detection and microscopic and macroscopic mapping and inversion, so that the problem that early corrosion is difficult to quantify due to the fact that contact ultrasound is mostly adopted in traditional pressure vessel detection and grain boundary micro-damage cannot be effectively identified is solved.

The invention discloses a neutral organic chelating cleaning agent for a boiler, and belongs to the field of chemical cleaning of boiler superheaters of thermal power plants. The cleaning agent is prepared from the following components in percentage by weight: 0.5%-5% of ethylenediamine tetraacetic acid ammonium, 0.1%-4% of acetic acid or ammonium acetate, 0.1%-3% of glycollic acid ammonium or glycollic acid, 0.1%-5% of a pH regulator, 0.1%-1% of a cosolvent, 0.2%-0.8% of a corrosion inhibitor SH369, 0.1%-0.6% of a reducing agent, 0.0%-0.3% of a defoaming agent, 0.0%-0.2% of a surfactant and 84%-93% of water, wherein the pH value of the cleaning agent is 6-8; the cosolvent is tartaric acid and / or hydroxybutyl diacid, the surfactant is nonylphenol polyoxyethylene ether, and the reducing agent is hydrazine. The cleaning agent disclosed by the invention has good dissolving capacity on oxide skin, does not generate precipitates to cause pipe blockage, is a neutral solution, is very small in corrosivity, does not generate intergranular corrosion, is beneficial to protecting various pipes of superheaters and reheaters, and is a safe and efficient superheater cleaning agent.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

The application discloses an intermediate processing liquid for an electroless nickel immersion gold (ENIG) production line and a chemical gold preparation method. The intermediate processing liquid is applied between the electroless nickel plating and immersion gold processes, and comprises (a) a pH buffer and a metal ion complexing agent: a total concentration of 50-150 g / L; (b) an adsorptive corrosion inhibitor: a concentration of 0.5-5.0 g / L; (c) a low-foam non-ionic surfactant: a concentration of 0.01-10 g / L; (d) an auxiliary antioxidant: a concentration of 0.5-30 g / L; (e) a dissolving agent: a concentration of 1-50 ml / L; (f) a pH regulator: an appropriate amount, which is added to maintain the pH value of the intermediate processing liquid at 4.0-6.5; and (g) deionized water: a balance, so that the concentrations of the above components reach the set target values; and the intermediate processing liquid has a design use temperature of 20-45 DEG C. The intermediate processing liquid removes residual nickel ions on the board surface and in micropores through strong complex cleaning, and blocks the pollution to the subsequent gold tank; meanwhile, the preferential adsorption of the corrosion inhibitor molecules at the nickel layer grain boundaries forms a controllable molecular-level protective film, effectively adjusts the immersion gold replacement reaction kinetics, and prevents the occurrence of intergranular corrosion (black plate).

The invention relates to a method and a product for regenerating and repairing duplex stainless steel, the duplex stainless steel is used for a nuclear-grade main pipeline, pulse current with optimized parameters is adopted to treat the duplex stainless steel in the nuclear-grade main pipeline with pitting corrosion or intergranular corrosion generated in the service process, the corrosion resistance of the duplex stainless steel is recovered, and dynamic self-repairing of a passive film is achieved. According to the method, pulse current in-situ / near-in-situ treatment is carried out on the duplex stainless steel for the nuclear-grade main pipeline under the electric-thermal coupling condition, components do not need to be disassembled or large-volume furnace heating does not need to be carried out, and the structure and geometric accuracy of a casting are not changed; by selecting matched parameters such as pulse frequency, pulse width, current density and treatment time, an amplitude-modulated decomposed structure in a ferrite phase and a phase interface precipitated phase are promoted to be re-dissolved, the formation dynamics and stability of a passive film are improved, and the corrosion resistance and toughness of an aged material are recovered or close to an unaged state.

The invention relates to the technical field of laser welding, in particular to a water curtain cooling stainless steel pipe intelligent laser welding device which comprises a machine body, and a welding mechanism is arranged on the machine body and used for stainless steel pipe welding machining. The water curtain assembly comprises a lower ring frame fixed to the outer wall of the lower end of the laser welding device, L-shaped supports are pivoted to the outer walls of the left end and the right end of the lower ring frame, round sleeves are fixed to the outer ends of the L-shaped supports, nozzles are installed in the round sleeves in a penetrating mode, an upper ring frame is fixed to the outer wall of the upper end of the laser welding device, and first air cylinders are pivoted to the outer walls of the left end and the right end of the upper ring frame. The lower output end of the first cylinder is pivoted with the upper end of the L-shaped bracket; the welding seam is precisely covered and rapidly cooled through the dynamically adjusted flat water curtain, the intergranular corrosion tendency is remarkably restrained, welding deformation is reduced, meanwhile, air is isolated to improve surface oxidation, and the corrosion resistance, the size precision and the appearance quality of a connector are comprehensively improved.

The invention relates to the technical field of pressure vessel intergranular corrosion detection, in particular to a nonlinear ultrasonic guided wave detection method for pressure vessel intergranular corrosion. The system comprises a signal generation and emission module, a signal acquisition and preprocessing module, a feature extraction and analysis module, a damage positioning and evaluation module, an optimization and calibration module and a data storage and visualization module. According to the invention, through cooperative work of the multi-band excitation signal and the distributed sensor array, the detection sensitivity and resolution are significantly improved; a nonlinear characteristic matrix and a multi-level decomposition capture material nonlinear effect are utilized to realize accurate positioning and evaluation; an adaptive parameter adjustment mechanism simplifies the operation process and reduces the detection cost; and a cloud database and a graphical interface are convenient for result storage and analysis. The intergranular corrosion can be efficiently and reliably detected, and a scientific basis is provided for the industrial field.

The utility model discloses a kind of grinding devices of electrostatic contact, belong to grinding processing equipment technical field, the grinding device includes the clamping assembly for clamping electrostatic contact, first station is equipped on clamping assembly, hot shrink tube is placed on first station, hot shrink tube is inserted for the clamping part of electrostatic contact, air gun assembly is equipped on clamping assembly, air gun assembly can spray high-temperature hot gas, when clamping assembly moves to the clamping part of electrostatic contact, air gun assembly is spirally rotated with hot shrink tube as center, so that hot shrink tube is heat-shrunk and tightened and the clamping part of electrostatic contact is connected, to when clamping assembly clamps the clamping part of electrostatic contact, clamping assembly is clamped on heat-shrunk and tightened hot shrink tube.The utility model makes grinding fluid permeability zero by heat shrink tube sealing, radically cure intergranular corrosion, simultaneously, realize micro-newton level flexible clamping by heat shrink tube buffer, avoid clamping damage, and pass through the heating mode of spiral heating and end portion reinforcement to guarantee sealing property.

The invention discloses a steel plate, a hot stamping part and a preparation method and application thereof, and belongs to the technical field of alloy materials, the hot stamping part comprises an oxide layer, an alloy layer and a steel matrix, and the alloy layer is located between the oxide layer and the steel matrix; in the alloy layer, the phase proportion of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 80%, and the occurrence frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 1%. In addition, the invention further discloses a steel plate component and a preparation method of the hot stamping part and a hot forming process of the hot stamping part. According to the method, the LME resistance of the Fe content in the alloy layer is improved, meanwhile, the crystal configuration of the plating layer is regulated and controlled, the frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% in the zinc-iron alloy layer is improved, and the corrosion resistance of a hot forming part is considered while the LME resistance is achieved by means of the good intergranular corrosion resistance of the coincidence lattice structure.

The application belongs to the technical field of nickel alloy manufacturing, and particularly relates to a kind of wear-resistant and corrosion-resistant nickel-based alloy material and a preparation method thereof, the nickel-based alloy material is sintered from Ni-Cr-Mo pre-alloy powder, Co powder, Ta powder, rare earth oxide powder, titanium sponge powder and core-shell structure reinforcing phase, the reinforcing phase adopts the core-shell structure of Ni-Mo coated silicon carbide-graphite, which is used to eliminate heterogeneous interface pores and in-situ anchor effectively to prevent particle peeling, and effectively block the malignant outward diffusion of carbon atoms to protect the intergranular corrosion resistance of alloy matrix, the nickel-based alloy material is purified by in-situ deoxidization, carbide interface is anchored effectively, and the corrosion-resistant hardening of core-shell reinforcing phase, a high-bonding composite reinforcement network is built inside, the problem of intergranular corrosion caused by heterogeneous phase peeling and carbon diffusion is solved, and efficient combination of high metallurgical density, lubrication and corrosion resistance is realized.

The invention provides an ultralow-carbon stainless steel flux-cored wire protected by mixed gas, and belongs to the field of welding materials. The invention provides an ultralow-carbon stainless steel flux-cored wire protected by mixed gas. A flux core of the ultralow-carbon stainless steel flux-cored wire comprises the following components in percentage by weight: 1-8% of Mn; 0.1%-1% of Si; 25 to 40 percent of Cr; 15%-30% of Ni; the total amount of Na2O and K2O is 1-7%; 0-1% of fluoride; 1 to 6 percent of TiO2; 8%-15% of SiO2; 4 to 16 parts of ZrO2; 1 to 5 parts of MnO; and the balance of Fe. And the filling rate of the flux core is 24-32%. According to the flux-cored wire, the problems that an existing stainless steel flux-cored wire is many in weld oxidation color, unattractive in weld joint, difficult in deslagging and poor in gas hole sensitivity are solved, welding is conducted under the condition of 80% Ar + 20% CO2 mixed gas, and deposited metal obtained after welding has the tensile strength larger than or equal to 520 Mpa and the ductility larger than or equal to 25%. As a welding material for dissimilar steel butt joint and low alloy steel surface surfacing, good welding process performance, stable electric arc, no splashing and attractive weld joint forming are guaranteed, and it is guaranteed that welded metal has excellent intergranular corrosion performance.

A kind of Al-Mg-Mn-Zn-Er-Zr aluminum alloy plate welding joint preparation method suitable for low temperature corrosion service environment belongs to the field of welding.It includes the following steps: selecting warm rolling state Al-Mg-Mn-Zn-Er-Zr aluminum alloy plate as base material, matching specific component ER5E61 welding wire; the area to be welded is designed, mechanically polished and "alkali washing-acid washing"; under inert gas protection, using "primer-filling-capping" multi-layer multi-pass welding process, implementing gradient heat input in different passes; after welding, low temperature annealing treatment is carried out.The present application solves the problems of incomplete penetration, pore enrichment and low temperature brittleness during the welding of plate, the internal weld reaches the I level standard, the joint intergranular corrosion nitric acid weight loss value is less than 15mg / cm2, the strength and toughness of the joint at 77K low temperature is improved, the elongation after fracture is greater than or equal to 9.0%, and the fracture mode is changed to mixed fracture dominated by toughness.

This invention relates to the field of stainless steel materials technology, specifically to a nickel-chromium-molybdenum-containing marine splash zone-resistant and corrosion-inhibiting stainless steel material and its preparation process. The chemical composition of the stainless steel material, by mass percentage, includes: carbon ≤0.04%, silicon 0.5%-0.8%, manganese ≤0.8%, phosphorus ≤0.02%, sulfur ≤0.0015%, chromium 22%, nickel 10%-11%, molybdenum 3.0%-3.5%, copper 1.2%-1.5%, titanium 0.2%-0.25%, niobium 0.1%-0.15%, with the remainder being iron. This invention's stainless steel material, through scientific chemical composition design, constructs a stable basic corrosion-resistant system. Simultaneously, the introduction of specific elements exerts a synergistic effect, effectively enhancing the stability and density of the passivation film on the material surface. This significantly improves the material's resistance to pitting corrosion in marine splash zones, reduces the risk of chloride ion damage to the passivation film, effectively inhibits intergranular corrosion, greatly improves the material's corrosion resistance stability, and extends its service life in harsh marine environments.

The utility model belongs to the technical field of metallurgical equipment, particularly relates to material proportioning equipment for austenitic stainless steel intergranular corrosion resistance production, and provides the following scheme aiming at the problems of insufficient proportioning precision and serious impurity residue in the background technology: the material proportioning equipment comprises a bracket, and a double-screw conveyor is arranged on the outer wall of the top of the weighing table. The double-screw conveyor is linked with the weighing platform, the weight of materials is fed back to the PLC electric control cabinet in real time, the conveying speed is dynamically adjusted, and the matching error of key elements such as Cr and Ni is reduced. The design of the material supplementing pipe and the material distributing pipe supports multi-batch trace adding, component fluctuation caused by one-time feeding is avoided, the screen can intercept large-particle impurities, the electromagnetic iron remover adsorbs metal chippings through a high-intensity magnetic field, and the impurity removal rate is increased. And the top tank and the bottom hopper are designed in a split manner, so that the screen and the electromagnetic iron remover are convenient to clean regularly, the maintenance is convenient, and continuous production is not influenced.

The invention provides steel for a high-strength and high-corrosion-resistance chromium-titanium photovoltaic support and a preparation method of the steel, and belongs to the technical field of metal material preparation. The high-strength, high-toughness and high-corrosion-resistance steel for the chromium-titanium photovoltaic bracket is obtained through smelting, casting, forging and rolling in a vacuum induction furnace; according to the method, vacuum induction furnace two-stage titanium adding is combined with the high-purity argon stirring and composite deoxidation slagging technology, the titanium element yield and the oxygen content in steel are accurately controlled, and finally the purity of the molten steel w (T.O) is smaller than or equal to 40 ppm; through the dynamic recrystallization regulation and control technology in the multidirectional forging and temperature control rolling process, high-density uniform distribution of nanoscale (Ti, Cr) C precipitated phases larger than or equal to 3 * 10 < 15 > / m < 2 > is achieved; the yield strength of the prepared steel for the chromium-titanium photovoltaic support is larger than or equal to 650 MPa, the tensile strength is larger than or equal to 780 MPa, and the percentage elongation after fracture is larger than or equal to 18%; the salt spray corrosion rate is smaller than or equal to 0.05 mm / a, the pitting potential is larger than or equal to 0.85 V, an intergranular corrosion test has no tendency, the cost is reduced through waste steel, and the method is suitable for industrial production and has good application prospects in the field of photovoltaic support materials.

The application provides a gas cooled reactor nuclear power unit secondary loop and oxygenation treatment method, and relates to the technical field of oxygenation treatment of a gas cooled reactor nuclear power unit secondary loop. The oxygenation treatment method of the gas cooled reactor nuclear power unit secondary loop comprises a post-starting feedwater oxygenation conversion stage, a normal operation oxygenation control stage and a pre-shutdown feedwater oxygenation conversion stage. The oxygenation treatment method of the gas cooled reactor nuclear power unit secondary loop can effectively prevent dissolved oxygen from entering a steam generator heat transfer pipe during the starting and stopping stages, thereby avoiding intergranular corrosion and stress corrosion of the steam generator nickel-based alloy caused by the synergistic effect of dissolved oxygen and high-concentration anions.

Described herein are 6xxx series aluminum alloys which exhibit high corrosion resistance while maintaining high strength-to-weight ratio, formability, and weldability. The 6xxx series aluminum alloys include Cr to improve intergranular corrosion resistance while maintaining high strength and formability. 6xxx series aluminum alloys including Cr in amount from 0.05 wt. % to 0.50 wt. % improved IGC resistance. The Cr addition in 6xxx series aluminum alloys improves the corrosion resistance of aluminum alloy products formed from the aluminum alloy without causing a substantial loss in strength.

The present invention relates to the technical field of ferritic stainless steel, specifically an annealing method for improving the intergranular corrosion resistance of super ferritic stainless steel. To address the problem of how to improve the recrystallization annealing process to enhance the intergranular corrosion resistance of stainless steel plates while maintaining fine grains, a novel annealing method for improving the intergranular corrosion resistance of super ferritic stainless steel is provided. The method comprises three continuous annealing stages: a pre-precipitation annealing to pre-precipitate a nanoscale Laves phase; a recrystallization annealing to pin grain boundaries and refine grains; and finally, a resolubility annealing to dissolve the Laves phase at high temperature, dissolving Nb, Mo, and Si elements near the grain boundaries and precipitating Nb (C, N) particles. The drag effect of the solute Nb, Mo, and Si suppresses grain coarsening, thereby enhancing the intergranular corrosion resistance of the super ferritic stainless steel while maintaining fine grains and ensuring its mechanical properties.

The present invention provides a corrosion-resistant high-strength duplex stainless steel, comprising, by weight percentage: C 0.09% to 0.14%, Si ≤ 0.80%, Mn ≤ 0.80%, P ≤ 0.035%, S ≤ 0.030%, Cr 20.00% to 22.00%, Ni 4.80% to 5.80%, 0 < Mo ≤ 0.20%, Ti 0.35% to 0.65%, 0 < Al ≤ 0.13%, 0 < N ≤ 0.035%, with the remainder being iron and unavoidable impurities. The present invention also provides a method for preparing the corrosion-resistant high-strength duplex stainless steel, comprising: (1) smelting to obtain a steel ingot; (2) performing upsetting, drawing and forging on the steel ingot to obtain an intermediate billet; (3) performing a staged heat treatment on the intermediate billet, and then cooling. The corrosion-resistant high-strength duplex stainless steel provided by the present invention has significantly improved hot working properties and excellent intergranular corrosion resistance.

The present invention relates to the technical field of aluminum alloy production and processing, and discloses an oxidation-free high-corrosion-resistant aluminum alloy profile, its production process and application. The present invention optimizes the alloy composition design and reasonably adjusts the proportions of elements such as magnesium, silicon, iron, manganese and copper, so that the interaction between the alloy elements reaches the optimal state, which not only improves the strength of the alloy, reduces the product thickness and reduces the cost, but also promotes the transformation of the β-Fe phase into the α-Fe phase, thereby improving the corrosion resistance of the alloy. At the same time, by limiting the copper content, it is avoided to increase the intergranular corrosion sensitivity of the alloy. At the same time, the present invention strictly controls the roughness of the extruded profile surface, and without increasing the cost, by improving the surface treatment technology, the corrosion resistance of the aluminum alloy is improved, while not affecting its electrical conductivity, and the means of removing the oxidation process. In general, the present invention improves the corrosion resistance of the aluminum alloy and also reduces the cost, and has significant advantages.

The invention belongs to the technical field of microstructure simulation, and provides a method for simulating a local corrosion process of an Al-Cu-Li alloy laser welding joint aiming at the problem that a traditional CA model has defects in simulation of microscopic grain structure characteristics, the CA model is reconstructed on the basis of a Voronoi diagram method and test characterization data, and the local corrosion process of the Al-Cu-Li alloy laser welding joint is simulated. An intermetallic compound is introduced into a model for the first time, a three-dimensional CA model containing seven types of cells and five evolution rules is systematically constructed, and reproduction of local corrosion processes such as grain boundary preferential dissolution and corrosion channel expansion of a fusion region in an acid environment is achieved. Optimization design is carried out on model parameters based on a deep learning training algorithm, and the optimized model well reflects the actual intergranular corrosion morphology of the fusion zone.

The invention discloses an aluminum alloy composite board, a heat exchange tube and a heat exchanger, the aluminum alloy composite board comprises a core material layer, a first composite layer and a second composite layer, the first composite layer and the second composite layer are arranged on the two sides of the core material layer in the thickness direction of the core material layer respectively, and the core material layer comprises, by mass, 1.0-2.0% of Mn, 0.1-1.0% of Fe, 0.1-3.0% of Cu, smaller than or equal to 0.10% of Ce, smaller than or equal to 0.3% of Si, smaller than or equal to 0.1% of Mg, smaller than or equal to 0.5% of P, smaller than or equal to 0.5% of S and the balance Al. The core material layer comprises the following components in percentage by weight: less than or equal to 0.5% of Zn, less than or equal to 0.25% of Zr, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ti and the balance of Al and inevitable impurity elements, and Al-Cu-Ce alloy is formed on the core material layer. According to the aluminum alloy composite board, Ce is introduced into the core material layer, the Ce and Cu have strong interaction, an Al-Cu-Ce alloy is formed, the probability of intergranular corrosion is reduced, and the corrosion resistance of the aluminum alloy composite board is improved.

The invention belongs to the technical field of metal materials, and particularly relates to rare earth-antimony synergistic alloying corrosion-resistant steel special for photovoltaic and a preparation method of the corrosion-resistant steel. The corrosion-resistant steel special for photovoltaic is prepared from, by weight, 0.04%-0.08% of C, 0.20%-0.50% of Si, 0.80%-1.50% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.003% of S, 1.50%-3.00% of Cr, 0.20%-0.50% of Mo, 0.10%-0.40% of Ni, 0.010%-0.030% of RE, 0.05%-0.20% of Sb, 0.02%-0.05% of Als, smaller than or equal to 0.0050% of N and the balance Fe and inevitable impurities. Wherein RE / S satisfies 3.5 < = RE / S < = 5.0, and Sb / Cr satisfies 0.03 < = Sb / Cr < = 0.08; and through a two-stage controlled rolling and controlled cooling process, a core-shell structure with rare earth sulfur oxide as a core and an antimony atom enrichment layer as a shell is formed on the ferrite grain boundary. By the adoption of the technical scheme, the grain boundary electrochemical stability can be improved, pitting corrosion resistance and intergranular corrosion resistance are remarkably enhanced, and meanwhile the excellent comprehensive performance of high strength and high toughness is obtained.

The application discloses a stress corrosion resistant austenitic stainless steel for nuclear power and a manufacturing method thereof. The chemical composition of the steel comprises C: 0.06%-0.10%; Si: 0.85%-1.20%; Mn: 1.65%-2.25%; P≤0.015%; S≤0.005%; Ni: 8.45%-9.55%; Cr: 16.25%-18.45%; Al: 0.80%-1.50%; Mg: 0.002%-0.004%; Nb: 0.015%-0.030%; and Zn: 0.002%-0.005%. The production process of smelting, continuous casting, heating, rolling and heat treatment is combined, the yield strength and tensile strength of the steel plate at room temperature are above 420 MPa and 752 MPa respectively, the yield strength and tensile strength during high-temperature tension at 650 DEG C are above 205 MPa and 412 MPa respectively, and the steel plate has good intergranular corrosion resistance and stress corrosion resistance.

The invention relates to the field of metal material performance testing, in particular to a stainless steel intergranular corrosion testing device and method.The stainless steel intergranular corrosion testing device comprises a reaction kettle, a circular plate is fixedly arranged in the reaction kettle, a plurality of corrosion-resistant containers are arranged above the circular plate, each corrosion-resistant container comprises a supporting bowl and a containing vessel, and the containing vessel is of a double-layer structure; a plurality of through holes are formed in the inner wall of the containing vessel, a plurality of filter grooves are formed in the outer wall of the containing vessel, rotating pipes are rotationally arranged at the bottoms of the supporting bowls, a multi-edge plug is arranged at the bottom of the containing vessel, a driving mechanism is arranged on the circular plate, a transmission mechanism is arranged between the rotating pipes and the circular plate, and a lifting pin is arranged in the containing vessel. Meanwhile, the transmission mechanism can drive the containing vessel to rotate through the rotating pipe, so that the corrosive liquid in the containing vessel continuously flows under the action of double movement, local temperature difference is avoided, measured intergranular corrosion data can more truly reflect the overall performance of the material, and the reliability of a test result is remarkably improved.

An intergranular corrosion sample bending device relates to the technical field of physical sample preparation and sampling of stainless steel intergranular corrosion samples, and comprises a bending mechanism, a stamping mechanism is fixed on the bending mechanism, the bending mechanism is used for placing and positioning a sample, and the stamping mechanism is used for 180-degree bending of the sample. 180-degree bending sampling can be achieved through one-time pressure applying operation, during sampling, a sample is bent into a V-shaped structure with the included angle being an acute angle through cooperation of a stamping head of the stamping mechanism and a stamping groove of the bending mechanism, then the sample is positioned through the stamping head of the stamping mechanism, and the sample is bent into a V-shaped structure with the included angle being an acute angle; the included angle of the sample is further reduced through the inner ejector rods which are close to each other inwards on the bending mechanism until 180-degree bending sampling is achieved, and the sample bending efficiency is improved through the operation mode.

The invention provides a non-standard Inconel 718 alloy super-long forged material and a manufacturing method thereof, and the manufacturing method comprises the following steps: preparing an electrode bar through vacuum induction melting, and carrying out electroslag remelting to obtain an electroslag ingot with the diameter of 500 + / -20 mm; carrying out homogenization heat preservation on the electroslag ingot at 1140-1200 DEG C for not less than 120 hours; after being cogged and deformed into square billets, the square billets are forged into round bars with the diameter phi being 180 + / -10 mm and the length being larger than 12000 mm through a high-speed forging machine within the single heating number, and the finish forging temperature is controlled to be larger than or equal to 980 DEG C so as to restrain delta phase precipitation; and then solid solution and aging heat treatment is conducted, the solid solution temperature is 1000 + / -10 DEG C, the aging temperature is 700 + / -10 DEG C, and solid solution for 2-4 hours and aging heat preservation for 6-8 hours are matched to meet the requirement for cross section through burning and structure consistency. The super-long forging material prepared by the method is uniform in chemical component, low in magnification and free of macroscopic defects, carbides in a high-magnification structure are uniformly distributed and free of Laves phases, the room-temperature mechanical property and the intergranular corrosion property can be comprehensively matched, and the method is suitable for manufacturing super-long high-temperature alloy forging materials with non-standard performance requirements.

The application belongs to the technical field of high-strength stainless steel, and provides a high-strength non-magnetic austenitic stainless steel rod suitable for nuclear fusion armor and a manufacturing method thereof.The high-strength non-magnetic austenitic stainless steel rod of the application eliminates high-temperature delta-ferrite and M23C6, so that it has excellent matching of strength and toughness and intergranular corrosion resistance at low temperature.The yield strength of the high-strength non-magnetic austenitic stainless steel rod of the application is greater than or equal to 1250 MPa at 4.2K liquid helium temperature, the tensile strength is greater than or equal to 1700 MPa, the elongation is greater than or equal to 25%, and the magnetic permeability is less than or equal to 1.02.The high-strength non-magnetic austenitic stainless steel rod of the application is an austenitic non-magnetic high-strength stainless steel, and can be directly applied to structural parts such as conductor armor of nuclear reactors and the like, and can also be popularly applied to high-strength stainless parts required in low-temperature engineering and other related fields, and has a broad market prospect.